1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <string_view>
11 
12 // constexpr const_iterator end() const;
13 
14 #include <string_view>
15 #include <cassert>
16 #include <cstddef>
17 
18 #include "test_macros.h"
19 
20 template <class S>
21 void
22 test(S s)
23 {
24     const S& cs = s;
25     typename S::iterator e = s.end();
26     typename S::const_iterator ce1 = cs.end();
27     typename S::const_iterator ce2 = s.cend();
28 
29     if (s.empty())
30     {
31         assert(  e ==  s.begin());
32         assert(ce1 == cs.begin());
33         assert(ce2 ==  s.begin());
34     }
35     else
36     {
37         assert(  e !=  s.begin());
38         assert(ce1 != cs.begin());
39         assert(ce2 !=  s.begin());
40     }
41 
42     assert(static_cast<std::size_t>(  e -  s.begin()) == s.size());
43     assert(static_cast<std::size_t>(ce1 - cs.begin()) == cs.size());
44     assert(static_cast<std::size_t>(ce2 - s.cbegin()) == s.size());
45 
46     assert(  e == ce1);
47     assert(  e == ce2);
48     assert(ce1 == ce2);
49 }
50 
51 
52 int main()
53 {
54     typedef std::string_view    string_view;
55 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
56     typedef std::u8string_view  u8string_view;
57 #endif
58     typedef std::u16string_view u16string_view;
59     typedef std::u32string_view u32string_view;
60     typedef std::wstring_view   wstring_view;
61 
62     test(string_view   ());
63     test(u16string_view());
64     test(u32string_view());
65     test(wstring_view  ());
66     test(string_view   ( "123"));
67     test(wstring_view  (L"123"));
68 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
69     test(u8string_view{u8"123"});
70 #endif
71 #if TEST_STD_VER >= 11
72     test(u16string_view{u"123"});
73     test(u32string_view{U"123"});
74 #endif
75 
76 #if TEST_STD_VER > 11
77     {
78     constexpr string_view       sv { "123", 3 };
79 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
80     constexpr u8string_view u8sv  {u8"123", 3 };
81 #endif
82     constexpr u16string_view u16sv {u"123", 3 };
83     constexpr u32string_view u32sv {U"123", 3 };
84     constexpr wstring_view     wsv {L"123", 3 };
85 
86     static_assert (    sv.begin() !=    sv.end(), "" );
87 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
88     static_assert (  u8sv.begin() !=  u8sv.end(), "" );
89 #endif
90     static_assert ( u16sv.begin() != u16sv.end(), "" );
91     static_assert ( u32sv.begin() != u32sv.end(), "" );
92     static_assert (   wsv.begin() !=   wsv.end(), "" );
93 
94     static_assert (    sv.begin() !=    sv.cend(), "" );
95 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
96     static_assert (  u8sv.begin() !=  u8sv.cend(), "" );
97 #endif
98     static_assert ( u16sv.begin() != u16sv.cend(), "" );
99     static_assert ( u32sv.begin() != u32sv.cend(), "" );
100     static_assert (   wsv.begin() !=   wsv.cend(), "" );
101     }
102 #endif
103 }
104